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Zinc absorption in adult humans: the effect of protein sources added to liquid test meals

Published online by Cambridge University Press:  09 March 2007

Lena Davidsson ,
Annette Almgren ,
Brittmarie SandströM ,
Marc El-A Juillerat  and
Richard F Hurrell
Lena Davidsson
Affiliation:
Nestec Ltd, Nestl´Research Centre, PO Box 44, CH-1000 Lausanne 26, Switzerland
Annette Almgren
Affiliation:
Department of Clinical Nutrition, Gothenburg University, Annedalsklinikerna, S-41345 Göteborg, Sweden
Brittmarie SandströM
Affiliation:
Research Department of Human Nutrition, The Royal Veterinary and Agricultural University, Rolighedsvej 25, DK-1958 Fredriksberg, Denmark
Marc El-A Juillerat
Affiliation:
Nestec Ltd, Nestl´Research Centre, PO Box 44, CH-1000 Lausanne 26, Switzerland
Richard F Hurrell
Affiliation:
Nestec Ltd, Nestl´Research Centre, PO Box 44, CH-1000 Lausanne 26, Switzerland
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Abstract

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The influence of different protein sources on Zn absorption was evaluated in healthy adults by radioisotopic labelling of single meals, followed by whole-body retention measurements 14 d after intake. Semi-synthetic liquid diets were used for the evaluation of different animal-protein sources and dephytinized soyabean-protein isolate ( ··01 g phytic acid/kg). Zn absorption was measured in the same subjects from identical test meals containing no added protein. No statistically significant differences were found in the Zn absorption from test meals containing bovine whey, casein or egg albumen when compared with test meals without added protein. Bovine serum albumin (BSA) and soyabean-protein isolate (< ··01 g phytic acid/kg) significantly reduced the mean absorption of Zn from 45–49% (no added protein) to 38·0 (SD 10·9) (BSA, P < ··05) and 33·9 (SD 12·6)% (soyabean-protein isolate < ··01 g phytic acid/kg, P < ··01). These results demonstrate that Zn absorption is inhibited by certain protein sources, such as BSA and dephytinized soyabean-protein isolate, while other proteins have little or no effect.

Keywords

ZincProteinRadioisotope
Type
Zinc absorption
Information
British Journal of Nutrition , Volume 75 , Issue 4 , April 1996 , pp. 607 - 613
Copyright
Copyright © The Nutrition Society 1996

References

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